- time interval, interval - a definite length of time marked off by two instants
--1 is a kind of measure, quantity, amount
--1 has particulars: - interval - a set containing all points (or all real numbers) between two given endpoints
--2 is a kind of set
--2 has particulars:closed interval, bounded interval; open interval, unbounded interval; sub-interval - interval, separation - the distance between things; "fragile items require separation and cushioning"
--3 is a kind of distance
--3 has particulars: clearance- interval, musical interval - the difference in pitch between two notes
--4 is a kind of musical notation
--4 has particulars:tone, whole tone, step, whole step; semitone, half step; quarter tone, quarter-tone; octave, musical octave; third; fourth; fifth; sixth; seventh - interval, separation - the distance between things; "fragile items require separation and cushioning"